Tag Archives: tetrahedron

The TDD Tetrahedron, version 2.0

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The TDD Tetrahedron, or if you wish, pyramid, has reached 2.0. Like cars, the new model is bigger and comes with new technology.

By pure coincidence, I ran into somebody willing to print this. So here it is, the version 2.0 of the TDD Tetrahedron. The new version has sides of 100 mm and it is made of plastic.

What’s it for?

Well, if you didn’t use the older version, you may be wondering what’s so great about this. It is all about mental focus.

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The TDD Tetrahedron, version 1.0

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The TDD Tetrahedron has reached version 1.0.

As I write this, we have a course on advanced TDD with Robert C Martin as teacher.  I took the opportunity to introduce the first version to the participants.
Uncle Bob and the TDD Tetrahedron
Uncle Bob and the TDD Tetrahedron.

Some of you that participated, asked me for a digital version which I mailed to you. I thought that there may be other people that are interested, so, here is the PDF for you to download. There is no read-me file but you only need scissors and tape.

The biggest change from the prototype I presented in an earlier post, is that the bottom is removed. It became easier to put it together that way.

I really tried to find some way to manufacture it in plastic or paper to a reasonable price, but failed. I also thought about doing a TDD pen,   A pen with three sides where each side would be red, green or yellow in a similiar way to the tetrahedron, But that failed since the sides could not have different colors.

The TDD pen
Anyway, if you have any clue on manufacturing any of these ideas, I will be happy to hear from you!

The TDD Tetrahedron

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Are you looking for some concrete expression for Test Driven Development? Let me give you a glimpse of what I am working currently on – the TDD Tetrahedron.

The idea originates from when a colleague at Crisp, David Barnholdt, wrote about not focusing on one step at the time. So I thought for a while and came up with this idea, a tetrahedron where each side displayed “failing test”, “implementation” and “refactor”, respectively.

You turn it and look at the first side where you read “failing test”. You write a failing test and turn it again, reading “implementation”. Write the implementation and run the test to get the green bar. Once again you turn the tetrahedron and read “refactor”. You look for something to refactor, confident that if you do, you will be supported by unit tests all the way.

Or the thing just sit on your table to tell everyone how cool you are as being a TDD programmer. At least wish to be. 🙂

Anyways, here are some sneak preview pictures of the greatest thing that ever happened to the world of programming, ta da – the TDD Tetrahedron!

TDD TetrahedronTDD TetrahedronTDD Tetrahedron